10. Historically, when a human being contracted the Bubonic Plague, death was likely imminent. What was the fate of the other two in the cycle, the rat (black rat-Rattus Rattus, Brown rat-Rattus Norvegicus) and the flea (Xenopsylla Cheopsis)?
From Quiz The Plague, Bawth, the Plague ... Achoo!
Answer:
Both rat and flea died
The infected rat suffered the same fate as the human, dying within a week. When the bacterium (Yersinia Pestis) from an infected rodent was ingested by the flea, the flea's stomach became blocked. This resulting hunger drove the flea in search of food, biting and feeding voraciously on its new victim, the human. Infected flea blood then passed on to the host while the flea died of starvation.
The cycle continued.
The bacterium, Yersinia Pestis, resembles a chromosome strand.
It was named after the Swiss bacteriologist, Alexandre Yersin, who identified it in 1894.